Helama Samuli, Holopainen Jari, Macias-Fauria Marc, Timonen Mauri, and Mielikäinen Kari. 2013. “A Chronology of Climatic Downturns through the Mid- and Late- Holocene: Tracing the Distant Effects of Explosive Eruptions from Palaeoclimatic and Historical Evidence in Northern Europe”. Polar Research 32 (February). https://doi.org/10.3402/polar.v32i0.15866.